Source of sperm and egg’s zinc sparks identified
![zinc sparks](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/12/ticker_eggsparks_free.jpg?fit=860%2C460&ssl=1)
As a sperm invades a mouse egg, zinc sparks (yellow) fly from pouches beneath the egg's surface (green), kicking off the switch from egg to embryo.
Northwestern University
As a sperm invades a mouse egg, zinc sparks (yellow) fly from pouches beneath the egg's surface (green), kicking off the switch from egg to embryo.
Northwestern University